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package quic
import (
"os"
"strconv"
"testing"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/qerr"
"github.com/quic-go/quic-go/internal/wire"
"github.com/stretchr/testify/require"
)
func TestCryptoStreamDataAssembly(t *testing.T) {
str := newCryptoStream()
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("bar"), Offset: 3}))
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("foo")}))
// receive a retransmission
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("bar"), Offset: 3}))
var data []byte
for {
b := str.GetCryptoData()
if b == nil {
break
}
data = append(data, b...)
}
require.Equal(t, []byte("foobar"), data)
}
func TestCryptoStreamMaxOffset(t *testing.T) {
str := newCryptoStream()
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{
Offset: protocol.MaxCryptoStreamOffset - 5,
Data: []byte("foo"),
}))
require.ErrorIs(t,
str.HandleCryptoFrame(&wire.CryptoFrame{
Offset: protocol.MaxCryptoStreamOffset - 2,
Data: []byte("bar"),
}),
&qerr.TransportError{ErrorCode: qerr.CryptoBufferExceeded},
)
}
func TestCryptoStreamFinishWithQueuedData(t *testing.T) {
t.Run("with data at current offset", func(t *testing.T) {
str := newCryptoStream()
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("foo")}))
require.Equal(t, []byte("foo"), str.GetCryptoData())
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("bar"), Offset: 3}))
require.ErrorIs(t, str.Finish(), &qerr.TransportError{ErrorCode: qerr.ProtocolViolation})
})
t.Run("with data at a higher offset", func(t *testing.T) {
str := newCryptoStream()
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("foobar"), Offset: 20}))
require.ErrorIs(t, str.Finish(), &qerr.TransportError{ErrorCode: qerr.ProtocolViolation})
})
}
func TestCryptoStreamReceiveDataAfterFinish(t *testing.T) {
str := newCryptoStream()
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("foobar")}))
require.Equal(t, []byte("foobar"), str.GetCryptoData())
require.NoError(t, str.Finish())
// receiving a retransmission is ok
require.NoError(t, str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("bar"), Offset: 3}))
// but receiving new data is not
require.ErrorIs(t,
str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("baz"), Offset: 4}),
&qerr.TransportError{ErrorCode: qerr.ProtocolViolation},
)
}
func expectedCryptoFrameLen(offset protocol.ByteCount) protocol.ByteCount {
f := &wire.CryptoFrame{Offset: offset}
return f.Length(protocol.Version1)
}
func TestCryptoStreamWrite(t *testing.T) {
str := newCryptoStream()
require.False(t, str.HasData())
_, err := str.Write([]byte("foo"))
require.NoError(t, err)
require.True(t, str.HasData())
_, err = str.Write([]byte("bar"))
require.NoError(t, err)
_, err = str.Write([]byte("baz"))
require.NoError(t, err)
require.True(t, str.HasData())
for i := range expectedCryptoFrameLen(0) {
require.Nil(t, str.PopCryptoFrame(i))
}
f := str.PopCryptoFrame(expectedCryptoFrameLen(0) + 1)
require.Equal(t, &wire.CryptoFrame{Data: []byte("f")}, f)
require.True(t, str.HasData())
f = str.PopCryptoFrame(expectedCryptoFrameLen(1) + 3)
// the three write calls were coalesced into a single frame
require.Equal(t, &wire.CryptoFrame{Offset: 1, Data: []byte("oob")}, f)
f = str.PopCryptoFrame(protocol.MaxByteCount)
require.Equal(t, &wire.CryptoFrame{Offset: 4, Data: []byte("arbaz")}, f)
require.False(t, str.HasData())
}
func TestInitialCryptoStreamServer(t *testing.T) {
str := newInitialCryptoStream(false)
_, err := str.Write([]byte("foobar"))
require.NoError(t, err)
f := str.PopCryptoFrame(expectedCryptoFrameLen(0) + 3)
require.Equal(t, &wire.CryptoFrame{Offset: 0, Data: []byte("foo")}, f)
require.True(t, str.HasData())
// append another CRYPTO frame to the existing slice
f = str.PopCryptoFrame(expectedCryptoFrameLen(3) + 3)
require.Equal(t, &wire.CryptoFrame{Offset: 3, Data: []byte("bar")}, f)
require.False(t, str.HasData())
}
func reassembleCryptoData(t *testing.T, segments map[protocol.ByteCount][]byte) []byte {
t.Helper()
var reassembled []byte
var offset protocol.ByteCount
for len(segments) > 0 {
b, ok := segments[offset]
if !ok {
break
}
reassembled = append(reassembled, b...)
delete(segments, offset)
offset = protocol.ByteCount(len(reassembled))
}
require.Empty(t, segments)
return reassembled
}
func skipIfDisableScramblingEnvSet(t *testing.T) {
t.Helper()
disabled, err := strconv.ParseBool(os.Getenv(disableClientHelloScramblingEnv))
if err == nil && disabled {
t.Skip("ClientHello scrambling disabled via " + disableClientHelloScramblingEnv)
}
}
func TestInitialCryptoStreamClientStatic(t *testing.T) {
skipIfDisableScramblingEnvSet(t)
str := newInitialCryptoStream(true)
clientHello := getClientHello(t, "quic-go.net")
_, err := str.Write(clientHello)
require.NoError(t, err)
require.True(t, str.HasData())
_, err = str.Write([]byte("foobar"))
require.NoError(t, err)
segments := make(map[protocol.ByteCount][]byte)
f1 := str.PopCryptoFrame(protocol.MaxByteCount)
require.NotNil(t, f1)
segments[f1.Offset] = f1.Data
require.True(t, str.HasData())
f2 := str.PopCryptoFrame(protocol.MaxByteCount)
require.NotNil(t, f2)
require.NotContains(t, segments, f2.Offset)
segments[f2.Offset] = f2.Data
require.True(t, str.HasData())
require.NotEqual(t, f2.Offset, protocol.ByteCount(len(f1.Data)))
f3 := str.PopCryptoFrame(protocol.MaxByteCount)
require.NotNil(t, f2)
require.NotContains(t, segments, f3.Offset)
segments[f3.Offset] = f3.Data
require.True(t, str.HasData())
require.NotEqual(t, f3.Offset, protocol.ByteCount(len(f2.Data)))
f4 := str.PopCryptoFrame(protocol.MaxByteCount)
require.NotNil(t, f4)
require.NotContains(t, segments, f4.Offset)
segments[f4.Offset] = f4.Data
require.Equal(t, []byte("foobar"), f4.Data)
require.False(t, str.HasData())
require.NotEqual(t, f4.Offset, protocol.ByteCount(len(f3.Data)))
reassembled := reassembleCryptoData(t, segments)
require.Equal(t, append(clientHello, []byte("foobar")...), reassembled)
}
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